Discussion for Pressure Trace Jan.24
Jan 24, 2011 21:08:46 GMT -5
Post by Richard on Jan 24, 2011 21:08:46 GMT -5
TRACES BE FOUND BY FOLLOWING THIS LINK
OK, here are some additional things. First of all, I was going to put my old (over 3500 shots) recessed breech plug in after the first two targets! When I pulled my bolt out, I was surprised that it was not covered with soot as usual. I had been cleaning the bolt three or four times during my range sessions. I was thinking that the the carbon was coming from the erosion around the face of the firing pin support? In fact, it was not! It was coming from a gap around the nose of the breech plug......apparantly. So, at this time I decided to leave the new one in. What I had in the past was when the collar or shoulder started getting slightly uneven from erosion? I would very slightly trim it off in the lathe. I felt the breech plug threads would take up the the space when tightened. Apparently not! So that meant there was gas pressure leaking past the shoulder............and the gun did not blow up
My opinion was also that any pressure leakage would be minimal anyway? As I had explained previously, it would (IMHO) be much like putting a high pressure air hose on your tire valve. It takes time for the high pressure to migrate to the space behind the nose............meanwhile, as the bullet moves forward, the pressure is dropping. So now I am thinking about making a collar or washer to help seal that area?
??
The second thing I had happen was when I got home and went to take the vent liner out of the new breech plug (yes, I had put anti-seize on it). Using good quality Allen keys, I could not remove the vent liner before it stripped the inside out. Tried the heat, but with the inside stripped, it would not go
Oh, well, I guess this was a good time to recess the plug ;D So I just drilled it out, recessed it and re-threaded it
Those first two shots way out of the group just like last week still baffles me!
Richard
OK, here are some additional things. First of all, I was going to put my old (over 3500 shots) recessed breech plug in after the first two targets! When I pulled my bolt out, I was surprised that it was not covered with soot as usual. I had been cleaning the bolt three or four times during my range sessions. I was thinking that the the carbon was coming from the erosion around the face of the firing pin support? In fact, it was not! It was coming from a gap around the nose of the breech plug......apparantly. So, at this time I decided to leave the new one in. What I had in the past was when the collar or shoulder started getting slightly uneven from erosion? I would very slightly trim it off in the lathe. I felt the breech plug threads would take up the the space when tightened. Apparently not! So that meant there was gas pressure leaking past the shoulder............and the gun did not blow up
My opinion was also that any pressure leakage would be minimal anyway? As I had explained previously, it would (IMHO) be much like putting a high pressure air hose on your tire valve. It takes time for the high pressure to migrate to the space behind the nose............meanwhile, as the bullet moves forward, the pressure is dropping. So now I am thinking about making a collar or washer to help seal that area?
??The second thing I had happen was when I got home and went to take the vent liner out of the new breech plug (yes, I had put anti-seize on it). Using good quality Allen keys, I could not remove the vent liner before it stripped the inside out. Tried the heat, but with the inside stripped, it would not go
Oh, well, I guess this was a good time to recess the plug ;D So I just drilled it out, recessed it and re-threaded it Those first two shots way out of the group just like last week still baffles me!
Richard
